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-mate-calc GTK3 version
+# Introduction.
 
-1. Introduction.
-----------------
+This is `mate-calc`, a fork of `gnome-calc`, the calculator application
+that was previously in the OpenWindows Deskset of the Solaris 8
+operating system.
 
-This is mate-calc, a fork of gnome-calc, the calculator application that was
-previously in the OpenWindows Deskset of the Solaris 8 operating system.
-
-It incorporates a multiple precision arithmetic packages based on the work
-of Professor Richard Brent, who has also kindly given me permission to make
-it available.
+It incorporates a multiple precision arithmetic packages based on the
+work of Professor Richard Brent, who has also kindly given me
+permission to make it available.
 
 There is a single graphics driver for Gtk3 included with this release.
 
+## Getting started.
+
+The manual pages also describe how to use `mate-calc` in detail.
+
+
+## Calctool history.
+
+Calctool was a project I worked on before I joined the OpenWindows
+DeskSet engineering group at Sun. It was originally released to
+comp.sources.unix in the late 1980's, and worked with many different
+graphics packages including SunView, X11, Xview, NeWS and MGR. There
+was also a version that worked on dumb tty terminals.
+
+It used a double-precision maths library that was a combination of the
+work of Fred Fish and various routines that were in the BSD 4.3 maths
+library.
+
+A lot of people in the community provided feedback in the form of
+comments, bug reports and fixes. In 1990, I started working in the
+DeskSet engineering group. I was working for Sun Microsystems in
+Australia at the time, (having moved there from England in 1983).
+
+I searched around looking for multiple precision maths libraries and
+found a package called MP written in FORTRAN by Richard Brent. I
+converted it to C, adjusted the glue between the resultant code and the
+calctool code, and this went on to be the basis of the calculator that
+was in the OpenWindows DeskSet. I also added scientific, financial and
+logical modes. This calctool was also the basis of the dtcalc
+application that is a part of CDE (albeit I had nothing to do with
+that).
+
+With its inclusion in the MATE CVS repository, it was renamed to
+`mate-calc`.
+
+More recently, Sami Pietila provided arithmetic precedence support and
+Robert Ancell converted the UI to use Glade.
+
+
+## Acknowledgements.
+
+See the AUTHORS file.
 
-2. Getting started.
--------------------
+Suggestions for further improvement would be most welcome, plus bug
+reports and comments.
 
-The manual pages also describe how to use mate-calc in detail.
+The Mate Team.
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